Kotoku Onsen is a small hot spring area in Oku-Nikko, tucked into the highland landscape of Nikko National Park in Tochigi Prefecture. Compared with the better-known onsen towns in the region, it feels notably quiet and remote, surrounded by forest and close to some of Oku-Nikko’s best-known natural scenery.
For travelers exploring the Nikko highlands, Kotoku Onsen is less about a busy resort atmosphere and more about its setting. The appeal lies in the sense of calm that comes with the mountain air, the changing seasons, and the wider landscape of marshes, woods, and lakes that define this part of Nikko.